Francesco Messineo wrote > On Mon, Mar 8, 2021 at 11:52 PM Peter Rittwage < > peter_at_ > > wrote: >> >> This effect can be mostly eliminated by converting to Y/C video output. >> >> I find the 6567R56A and the original 326298 board video output looks >> really >> good with a couple simple mods. >> >> First, I put a 25-33ohm resistor between the left side of R9 and GND >> (left >> side of R11) which gets you about the right signal levels on the Luma >> line, >> as it's much too high normally on it's own. > > that's quite some load to Q4. The proper way to reduce the signal > would be increasing R9, this makes a voltage partition with the luma > input which is usually 75ohms. > By the way, R9 from the schematic seems to be 7.5 ohms? I need to > check on the actual board. If it's indeed so low, I would try a 75 > ohms R9 instead. > > Frank IZ8DWF R9 is already 75ohms on the board I am looking at. -Pete -- Sent from: http://cbm-hackers.2304266.n4.nabble.com/Received on 2021-03-16 02:00:03
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